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I dont think that plotting a line chart for a single record will be a good idea.

Anyways, to answer your question, number of records has nothing to do with the chart type. But if you have a single record, you wont be able to see any lines plotted in the chart area, rather you will see a single marker because atleast two data points are required to see a line (basic geometry :-) ) in the chart and I think you must be getting this single marker in your chart area for that single record.